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How to clean unloader valve..

I have a Karcher 2400 High pressure washer, high pressure does not always start when the trigger is pulled. I'm told I need to clean the inlet filter of the unloader valve. How do I do that ?

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The Karcher K2400HH and G2400HH do not have an unloader valve, they have a spill valve which is located under the black cap on top of the pump.

The spill valve needs to be removed and the side walls of the hole it sits in need to be wire brushed to remove deposits. then you can put it back in and put the pump back together.

Posted on Dec 31, 2009

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I have a Karcher G2500HT. When I pull the trigger the pump will not engage. I pulled the pump off, checked the seals, and cleaned the screen. When I put it back on there was no leakage but the pump...


I would have to agree with your service department. The unloader valve works like this, When you press the trigger it closes and allows the water to build pressure through the pump. When you let off the trigger the valve opens and by-passes the water through the pump so you don't damge the pump. If this valve is sticking and remaining open the pressure will not build. You can remove this valve and clean relubricate with white lithium grease just a coating and this should clear up your problem. Check the port that the valve sits in and if you see gunk just clean with carburetor cleaner and blow it out with air compressor. A new unloader valve can cost between $40.00 - $60.00. Try to clean first before you buy a new one. The valve is usually located near the outlet that you connect your pressure hose to. If you can't find it go to jackssmallenginerepair.com and do a parts look up for your machine and you will see where this valve is located. Hope this helps.

Jul 20, 2011 | Karcher 2500 PSI Pressure Washer

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High pressure won't return when triggered


If you unplug the tip, will it work? If so, unloader valve is sticking.

Jul 06, 2010 | Karcher 2500 PSI Pressure Washer

1 Answer

Hi k2 series have alot of trouble does not always start on full pressure pull the trigger it just squirts a stright line of water out of the gun takes a while to get on full pressure if at all. many thanks...


HI This is caused either by a partially blocked nozzle on the end of your lance or the unloader valve sticking inside the machine. You can clean your nozzle by inserting a pin etc inside the end to clean it out. If this doesn,t work then it is most likely the unloader sticking. You need to remove the yellow cover and remove the unloader valve assembly.This is the bit that goes in and out when pressing the trigger. Remove this section then grease and oil the unloader and re fit. This should cure your problem.

Jun 10, 2010 | Karcher K2.26 Electric Power Washer

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We have a Karcher G2500VH pressure washer. If you start the engine with the trigger pulled on the spray wand it will run at full pressure until you release the trigger. after that, when you pull the...


Hi, Karcher calls the unloader valve a spill valve,
this is a link to a full drawing/parts listing , and your fault description might well be a sticking /seized unloader(spill ) valve hope this helps
http://www.pressureparts.com/ManualViewPage.aspx?Manual=/mmDEV/PDF/karcherparts/g2500vh.pdf

the part number is on page 9 of the drawing
spill valve 45910400
hope this helps , we usually use some good quality silicone grease to lube the valve ,

Mar 07, 2010 | Karcher 2500 PSI Pressure Washer

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Unloader Valve - Karcher Pressure Washer


where is the unloader valve locaed on a Briggs Stratton pressure washer?

Oct 02, 2009 | Honda Karcher G4000RH Pressure Washer

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Once the trigger is released it won't starting spraying again.


I have the same problem. This is the responce for Karcher......

The unloader valve may be sticking, or is dirty. It probably needs to be cleaned and may need to be replaced, it is inexpensive. It gets a lot of use, but extends the life of the pump. The function of the unloader is to allow the machine to run in a bypass mode while the trigger of the gun is closed. First, a lack of high pressure can be caused by: 1. Insufficient water feeding to the unit, so check that the water is turned on all the way and that there are no kinks in the hose. 2. The inlet filter may be clogged. (it will need to be removed and thoroughly cleaned). 3. An internal water leak. 4.Also, low pressure can be caused by worn spray tips. If you have checked the first three with no resolution, the problem is internal and could be as simple as a sticking unloader valve. If you are mechanically inclined, you can clean this valve yourself and greasing the o-rings (use lithium based grease), or take it to a local service center. You do not need to take the pump apar
t. The unloader valve is located under the cover, and is secured with 2 bolts. (Use needle nose pliers to remove the valve) For those units with pressure and volume controls, the unloader is located under the pressure and volume control knobs themselves. Do not take any other bolts off or you will open the pump and lose the pump's oil.

Note: Lithium based grease will prevent future failure of the unloader valve.

Also, check websites such as fixya.com for tips and how-to info particularly on cleaning the unloader valve. Be sure to use lithium grease if you reassemble it.
I am going to check the manuel to see where it's at

Sep 24, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

No pressure / Karcher G 2400 HH


Hi ruthkapres:
Here is a diagram. The unloader/spill valve is #12 on page D2 or F2 depending on your model. You must pull it out, inspect the o-rings for dents or tears and make sure the valve is lubricated with a good water proof lubricant.

Jul 14, 2009 | Karcher G3025OH Pressure Washer

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